diff --git a/key-bindings.c b/key-bindings.c
index 0a2163bf..9730fb1b 100644
--- a/key-bindings.c
+++ b/key-bindings.c
@@ -64,7 +64,7 @@
 	" 'Kill' 'X' {kill-pane}" \
 	" 'Respawn' 'R' {respawn-pane -k}" \
 	" '#{?pane_marked,Unmark,Mark}' 'm' {select-pane -m}" \
-	" '#{?window_zoomed_flag,Unzoom,Zoom}' 'z' {resize-pane -Z}"
+	" '#{?#{>:#{window_panes},1},,-}#{?window_zoomed_flag,Unzoom,Zoom}' 'z' {resize-pane -Z}"
 
 static int key_bindings_cmp(struct key_binding *, struct key_binding *);
 RB_GENERATE_STATIC(key_bindings, key_binding, entry, key_bindings_cmp);